In class we should not talk at the same time; we should take turns.
上课时，我们不应同时发言，而应轮流发言。
We should not talk away our valuable time.
我们不应该把宝贵的时间消磨在闲谈之中。
Since we have a focused subject, you should not talk at large.
我们有一个焦点话题，所以你不应该东拉西扯地谈。
Since we have a focused subject, we should not talk at random.
既然我们有一个主题，那我们不应该随意谈与主题无关的。
Since we have a focused subject, we should not talk at random.
既然我们有一个主题，那我们不应该随意谈与主题无关的。
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